Based on the current W3 Web Components draft, X-Tag enables the custom element portion of the proposal. Custom elements let you register new tags/elements with the parser so they are recognized and inflated with special abilities you define.
http://mozilla.github.com/x-tag/
JavaScript Libraries and Functions
Get access to data on 4,017 websites that are X-Tag Customers. We know of 2,874 live websites using X-Tag and an additional 1,143 sites that used X-Tag historically and 1,184 websites in the United States.
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Get a list of 4,017 websites using X-Tag which includes location information, hosting data, contact details, 2,874 currently live websites and an additional 9,883 domains that redirect to sites in this list. 1,143 sites that used this technology previouslyand 1,184 websites in the United States currently using X-Tag.
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